Studer Vista, Operating Instructions Manual

Page: 107 / 713

Vista Digital Mixing System
Date printed: 05.08.03 SW V3.3
Parameters 3-33
source. This mode is only useful in two-channel mode, and presents a
very accurate sound field.
• HRTF – Mainly a cross-talk canceler using simplified HRTFs (Head
Related Transfer Functions). If the listener is positioned exactly in the
sweet spot of a ±30° speaker setup, an extreme panning position like
full left should effect the signal such that it will only be heard with the
left ear and cancelled out on the right. It may also be used for enlarging
the perceived width of a recording.
• USER – When this mode is selected, the panning algorithms are estab-
lished from the Microphone User Settings interface provided under the
main Option menu in the system Graphic Controller. The settings made
affect the relationship between amplitude and time differences, deter-
mined by the settings of the imaginary microphones. For details, see
chapter 3.6.7 .
AMBIENCE On/Off [88] Activates the room ambience. When set to Off, no reflected, but only di-
rect sound will be heard. The reflection part of VSP is basically turned off.
AMBIENCE [89] The AMBIENCE control changes the balance between the direct sound
and the indirect sound (i.e., the reflections). When the control is at 1%
there will only be direct sound. With the control at 100% there will only be
reflected sound. So with this control you can affect how much of the room
is “heard”.
DIST MAX [90] This control adjusts the relative perceived distance of the sound source, by
adjusting the reflections. It works in conjunction with the panner controls
so that it only has effect if the panner has the sound source panned to an
extreme location (on the perimeter of the panning circle). So if the distance
control is to be active, at least one panner control must be set away from
its centered position (or the joystick must be positioned out of center).
AutoLvl On/Off [91] The switch next to the distance control selects one of two distance modes.
When the switch is Off, the normal mode is active. When the switch is On,
the Film distance mode is active. Then the distance parameter also reduces
the audio level as the audio source is set for more distance. This is a real-
istic effect useful in mix-to-picture applications. In a music mix (with Film
mode off), the level is to remain constant even as the distance perception is
increased, so direct sound is decreased while a power normalizer maintains
a constant audio level.
ROOM ABSN [92] By changing this control, the high-frequency content of the reflections can
be adjusted (similar to a HF roll-off). With the control set to 1%, the sound
will be very bright, as if the walls were tile or marble. With the control at
100%, the reflections will be muffled, as if the walls were covered with
carpet.
ROOM SIZE [93] This sets the apparent room size that will determine the impulse response
generated by the VSP channel. Settings range from 0 to 31. The 0 setting
results in an impulse response that is around 40 ms long, and the highest
setting corresponds to a response where the longest reflection is around
200 ms. Note that this only affects the discrete reflection patterns. Late re-
flections are controlled within the reverb channel.
DIFFUSN [94] Diffusion controls the spreading of the reflections over time. If the discrete
reflections are too apparent, adding some diffusion will smear them over
time. The amount of diffusion should be set in accordance with the ab-
sorption control (as described later). A highly damped room accepts higher
diffusion, without sounding colored. The nominal setting is 50%.